Heating device capable of uniform sealing

ABSTRACT

The disclosure relates to a heating device capable of uniform sealing, uniformly applying heat at a constant temperature to the entire sealing portion of the to-be-sealed object to heat and seal the entire sealing portion at a constant temperature, thereby providing the uniform sealing thickness. A heating device capable of uniform sealing according to the disclosure comprises a heater for heating the sealing portion of the to-be-sealed object; a heat source supplier for supplying a heat source for heating to the heater; a heat transfer part accommodated in the heater, and transferring the heat source to the heater to heat the entire heater at a uniform temperature, and an additional heat transfer part disposed on the outer surface of the heat transfer part to conduct the heat source to the heater and in contact with the inner surface of the heater.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is based on and claims priority under 35 U.S.C. § 119to Korean Patent Application No. 10-2021-0104002, filed on Aug. 6, 2021,in the Korean Intellectual Property Office, the disclosure of which isincorporated by reference herein in its entirety.

TECHNICAL FIELD

Various embodiments of the disclosure relate to a heating device capableof uniform sealing, more particularly, a heating device capable ofuniform sealing which may minimize the temperature difference of thecomponent that heats the to-be-sealed object, when heating theto-be-sealed object at a certain temperature to seal the object.

DISCUSSION OF RELATED ART

Recently, second batteries which can be charged and discharged have beenwidely used as an energy source for wireless mobile devices.

Further, the secondary battery has attracted considerable attention as apower source for electric vehicles (EV) and hybrid electric vehicles(HEV) which have been developed to solve problems, such as airpollution, caused by existing gasoline and diesel vehicles using fossilfuels.

Small-sized mobile devices use one or several battery cells for eachdevice. On the other hand, middle or large-sized devices, such asvehicles, use a middle or large-sized battery module having a pluralityof battery cells electrically connected to one another as a part cellbecause high power and large capacity are necessary for the middle orlarge-sized devices.

Preferably, the middle or large-sized battery module is manufactured soas to have as small a size and weight as possible. For this reason, aprismatic battery or a pouch-type battery, which can be stacked withhigh integration and has a small weight-to-capacity ratio, is usuallyused as a battery cell of the middle or large-sized battery module. Inparticular, much interest is currently focused on the pouch-shapedbattery because the pouch-shaped battery is lightweight and less likelyto leak, and the manufacturing costs of the pouch-shaped battery arelow.

As shown, a typical pouch for a lithium-ion polymer battery case has amulti-layered structure formed by sequentially stacking a polyolefinlayer, an aluminum layer, and a nylon layer. As a thermal adhesionlayer, the polyolefin layer has a heat adhesion property to function asa sealing member. As a metal layer, the aluminum layer serves as a basematerial to provide mechanical strength and a barrier layer againstmoisture and oxygen. The nylon layer functions as a base material and aprotective layer.

A commonly used polyolefin-based resin layer may be formed of castedpolypropylene (CPP).

The shape of such pouch-type secondary batteries is variable, and thevolume and weight thereof are smaller than those of the other secondarybatteries having the same capacity as that of the pouch-type secondarybatteries.

Meanwhile, in a pouch-type secondary battery, a battery assemblyincluding a negative electrode, a separator, and a positive electrode isplaced in a pouch-type packaging material during the manufacturingprocess, an electrolyte is injected, and the edges are sealed. Then, thebattery is activated through several charge/discharge cycles.

In this case, sealing is essential in pouch-type secondary batteries.

The reason is that the deterioration of the sealing quality causesproblems directly related to safety, such as leakage of electrolyte(chemical) and fire.

The conventionally used sealing block seals the pouch using conductiveheat by inserting a cartridge heater. At this time, the temperature iscontrolled by controlling the power supply to the cartridge heater usinga controller. Even if the power supply is constant, temperaturenon-uniformity occurs depending on the turns ratio inside the cartridgeheater (even the identical product has a difference in turns ratio).

Recently, as the size of the pouch of the pouch-type secondary batteryincreases, the size of the sealing block is further increased.Therefore, it is impossible to secure the temperature uniformitytechnology only with the turns ratio of the cartridge heater; thus, thestability and reliability of the sealing quality rapidly deteriorate.

It is difficult to secure the reliability of the quality because thetemperature difference within the sealing block is more than 10 degreesdifferent (The appropriate temperature difference is within 3 degrees).

In the current cartridge method, efforts are made to match the turnsratio to ensure temperature uniformity. However, due to the processingand temperature characteristics, it is impossible to manufacture dozensof heaters that are applied in one line in the same way, deterioratingreliability.

In addition, when the heat of the cartridge heater is continuously lostin high-speed sealing, heat recovery within the block is very important,but it is challenging to recover beyond the material's thermalconductivity.

In the conventional large-sized pouch, which is 500 mm or moresignificant, the temperature non-uniformity of the cartridge heater is abig problem for stability, and there is no solution for heat loss andconductivity because there is no supplementary method other than theheat source of the heater.

SUMMARY

According to an embodiment, the disclosure provides a heating devicecapable of uniform sealing, which may uniformly supply heat at aconstant temperature to the entire sealing portion of the to-be-sealedobject to allow sealing by heating the entire sealing portion to auniform temperature, thereby providing a constant and uniform sealingthickness.

Further, the disclosure provides a heating device capable of uniformsealing, which may allow heat to rapidly circulate and transfer to theentire component that heats the to-be-sealed object in heating theto-be-sealed object to a certain temperature to seal the to-be-sealedobject so that heat is evenly distributed, and the temperaturedifference is not generated and may minimize heat loss with a storagefunction.

A heating device capable of uniform sealing according to the disclosurecomprises a heater for heating the sealing portion of a to-be-sealedobject; a heat source supplier for supplying a heat source for heatingto the heater; a heat transfer part accommodated in the heater andtransferring the heat source to the heater to heat the entire heater ata uniform temperature; and an additional heat transfer part disposed onthe outer surface of the heat transfer part to conduct the heat sourceto the heater and in contact with the inner surface of the heater.

Further, the heater is formed of nobinite or invar.

Further, the heater is provided with a first accommodating space foraccommodating the heat source supplier and a second accommodating spacefor accommodating the heat transfer part along the longitudinaldirection.

Further, the heater comprises blocking parts for closing both ends ofthe second accommodating space, and the blocking parts include at leastone through-hole.

Further, the heat transfer part is formed of a heat pipe.

Further, the additional heat transfer part is formed of thermal greaseand is injected between the outer surface of the heat transfer part andthe inner surface of the heating part.

Further, comprised is an injection guide disposed to be spaced apartfrom each other at regular intervals along the circumferential surfaceof the heat transfer part to form a partition wall for partitioning thethermal grease injected between the heater and the heat transfer part.

The heating device capable of uniform sealing according to thedisclosure applies a material having minor thermal deformation for aheater that heats the to-be-sealed object in contact with the sealingportion of the to-be-sealed object and applies a heat pipe capable ofuniformly transferring heat to the sealing portion of the to-be-sealedobject to uniformly supply heat at a constant temperature to the entiresealing portion of the to-be-sealed object, and this makes it possibleto heat and seal the entire sealing portion to a uniform temperature,thereby having an effect in that the sealing thickness of the sealingportion is constant and uniform.

Further, in heating the to-be-sealed object to a certain temperature toseal the object, heat is rapidly circulated and transferred to theentire component that heats the to-be-sealed object so that heat isevenly distributed, and temperature difference does not occur. The heatstorage function minimizes heat loss and recovers the lost heat at afast speed, thereby increasing the sealing performance and quality.

Further, since it is possible to uniformly heat the entire part of thecomponent that heats the to-be-sealed object at the desired temperaturethrough heat circulation and heat transfer action, there is an effectthat the entire sealing portion can be melted with properties suitablefor sealing. Due to this, the sealing portion can be completely sealedwithin a small pressing force, low temperature, and a short timecompared to the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS

A complete appreciation of the disclosure and many of the attendantaspects thereof will be readily obtained as the same becomes betterunderstood by reference to the following detailed description whenconsidered in connection with the accompanying drawings, wherein:

FIG. 1 is an exploded perspective view illustrating a heating devicecapable of uniform sealing according to an embodiment of the disclosure;

FIG. 2 is a combined perspective view illustrating a heating devicecapable of uniform sealing according to an embodiment of the disclosure;

FIG. 3 is a side view illustrating a heating device capable of uniformsealing according to an embodiment of the disclosure;

FIG. 4 is a half-sectional perspective view illustrating a heat transferpart applied to a heating device capable of uniform sealing according toan embodiment of the disclosure;

FIG. 5 is a front view illustrating the combined configuration of theheating device capable of uniform sealing according to an embodiment ofthe disclosure;

FIG. 6 is a cross-sectional view illustrating a configuration in whichan additional heat transfer part and a blocking part are applied to aheating device capable of uniform sealing according to an embodiment ofthe disclosure;

FIG. 7 is a perspective view illustrating an example in which aninjection guide part is applied to a heat transfer part applied to aheating device capable of uniform sealing according to an embodiment ofthe disclosure; and

FIG. 8 is a front view illustrating an example in which a heat transferpart and an additional heat transfer part of FIG. 7 are applied to theheater.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Advantages and features of the disclosure and methods of achieving themwill become apparent regarding the embodiments described below inconjunction with the accompanying drawings.

However, the disclosure is not limited to the embodiments disclosedbelow, but may be implemented in various different forms, and only theseembodiments allow the disclosure of the disclosure to be complete and isprovided to fully inform those of ordinary skill in the art to which thedisclosure pertains, the scope of the disclosure, and the disclosure isonly defined by the scope of the claims. Like reference numerals referto like elements throughout the specification.

Hereinafter, embodiments of the disclosure will be described in detailregarding the accompanying drawings so that those of ordinary skill inthe art to which the disclosure pertains can easily carry out thedisclosure. However, the disclosure may be embodied in several differentforms and is not limited to the embodiments described herein. Throughoutthe specification, reference numerals are assigned to similar parts.

FIG. 1 is an exploded perspective view illustrating a heating devicecapable of uniform sealing according to an embodiment of the disclosure;FIG. 2 is a combined perspective view illustrating a heating devicecapable of uniform sealing according to an embodiment of the disclosure;FIG. 3 is a side view illustrating a heating device capable of uniformsealing according to an embodiment of the disclosure; FIG. 4 is a halfsectional perspective view illustrating a heat transfer part applied toa heating device capable of uniform sealing according to an embodimentof the disclosure; FIG. 5 is a front view illustrating the combinedconfiguration of the heating device capable of uniform sealing accordingto an embodiment of the disclosure; FIG. 6 is a cross-sectional viewillustrating a configuration in which an additional heat transfer partand a blocking part are applied to a heating device capable of uniformsealing according to an embodiment of the disclosure; FIG. 7 is aperspective view illustrating an example in which an injection guidepart is applied to a heat transfer part applied to a heating devicecapable of uniform sealing according to an embodiment of the disclosure;and FIG. 8 is a front view illustrating an example in which a heattransfer part and an additional heat transfer part of FIG. 7 are appliedto the heating part.

The heating device capable of uniform sealing 1 according to anembodiment of the disclosure, is a product that can change its physicalproperties to a state that is easy to seal the sealing portion of theto-be-sealed object.

The to-be-sealed object may include various things, and hereinafter, anexample in which a pouch-type secondary battery is applied as theto-be-sealed object will be described below.

The pouch-type secondary battery may generally comprise a cell body anda cell pocket.

The cell body and the cell pocket may be integrally formed by sealingthe edges of the first and second surfaces of the same material andsize.

Furthermore, the cell body may accommodate the electrode assembly andthe electrolyte therein, and the cell pocket may be utilized to removethe gas present in the cell body.

Further, the heating device for sealing 1 according to the disclosureheats and melts the tab and pouch, the first pouch and the second pouch,etc., which are sealing portions of the secondary battery before sealingwith the sealing device.

To this end, the heating device for sealing 1 according to thedisclosure may comprise at least one heater 10, a heat source supplier20, a heat transfer part 30, an additional heat transfer part 40, and ablocking part 50.

The heating unit 10 may comprise a first heating block 11 formed in anapproximately ‘L’-shaped cross-sectional shape and a second heatingblock 12 disposed of in an upper stepped portion of the first heatingblock (11).

The first heating block 11 and the second heating block 12 may be formedof a material having excellent thermal conductivity.

The heater 10 is heated by a heat source supplier 20 to be describedlater. Further, in a state in which any one of the first heating block11 and the second heating block 12 is in contact with the sealingportion of the secondary battery pouch, heat is transferred, andthermally fused.

A first accommodating space 10 a in which the heat source supplier 20 isaccommodated to form along the longitudinal direction of the firstheating block 11.

Further, a second accommodating space 10 b in which the heat transferpart 30 to be described later is accommodated to form along thelongitudinal direction of the first heating block 11 and the secondheating block 12.

As not shown in the figures, a first accommodation space in which theheat source supplier 20 is accommodated may also be formed in the secondheating block 12.

In this case, the number of applications of the first accommodatingspace 10 a and the second accommodating space 10 b and the heat sourcesupplier 20, and the heat transfer part 30 accommodated therein is notlimited in the disclosure.

In other words, the first accommodating space 10 a, the secondaccommodating space 10 b and the heat source supplier 20, and the heattransfer part 30 accommodated therein are applied one by one or two ormore of each of the first accommodating space 10 a, the secondaccommodating space 10 b, the heat source supplier 20 and the heattransfer part 30 may be applied to increase the thermal conductivitywhile quickly heating the heater 10.

Further, the figures show an applied example in which one firstaccommodating space 10 a is formed in the first heating block 11, andtwo-second accommodating spaces 10 b are formed in each of the firstheating block 11, and the second heating block 12.

The first heating block 11 and the second heating block 12 describedabove may be formed of nobinite or invar.

First, nobinite may be formed from any one of CN-5, CD-5, CS-5, CF-5,and SI-5.

CN-5 is suitable for parts requiring low thermal expansion due torelatively high temperatures.

CN-5 has the property of expanding smaller than silicon at hightemperatures.

CD-5 and CS-5 are suitable for parts where low thermal expansion andstrength are essential. Its coefficient of thermal expansion is similarto that of SILICON WAFER, and it has high strength properties superiorto invar.

CF-5 has a high damping ability after low thermal expansion.

SI-5 has properties equivalent to super invar, and its coefficient ofthermal expansion is close to zero.

SI-5 is a material that can cope with thermal expansion better thangeneral invar (ALLOY36).

The physical properties of such nobinite are shown in Table 1 below.

Table 1 of nobintie's physical properties

TABLE 1 Properties CN-5 CD-5 CS-5 CF-5 SI-5 Coefficient of thermal 4.5 ×10⁻⁶ 2.8 × 10⁻⁶ 1.2 × 10⁻⁶ 2.5 × 10⁻⁶ 0.42 × 10⁻⁶ expansion (50° C.)Coefficient of thermal 3.5 × 10⁻⁶ 3.4 × 10⁻⁶ 1.5 × 10⁻⁶ 3.0 × 10⁻⁶ 0.76× 10⁻⁶ expansion (100° C.) Tensile strength (N/mm²) 550 400 500 200 500Proof stress (N/mm²) 350 220 300 270 Brinell Hardness 230 170 200 130160 Degree of Elongation (%) 5 18 20 15 Young's module (N/mm²) 137000127000 137000 88000 137000 Specific gravity 8.2 7.8 8.0 7.8 8.0 Thermalconductivity 0.278 0.209 0.206 0.209 0.209 (J/Cm, Sec, ° C.) Poisson'sratio 0.37 0.33 0.36 0.27 0.36 Specific heat (J/g, ° C.) 0.4556 0.48670.4598 0.4867

As shown in Table 1 above, it can be confirmed that all CN-5, CD-5,CS-5, CF-5, and SI-5 have low coefficients of thermal expansion at 50°C. and 100° C., and tensile strength, proof stress, and excellentBrinell hardness. The degree of elongation, the modulus of elasticity,and the thermal conductivity are more than twice that of the existingmetal heating block.

The heater (10) using these nobinites as the primary material, can heatand seal the sealing portion to a uniform temperature without thermaldeformation even when the temperature difference between the centralpart and both side parts is 10° C.

In other words, the heater 10 uniformly supplies heat at a constanttemperature to the entire sealing portion, thereby heating the entiresealing portion to a uniform temperature so that the sealing thicknessis constant.

Meanwhile, invar is a type of cast iron, meaning invariant steel, has aminimal coefficient of thermal expansion, and has the characteristics ofnot being rusted.

Invar is called Kovar, a low thermal expansion alloy, such as NILO K andAlloy K.

The components of Invar (based on Invar36) include 60% Fe, 35 to 38% Ni,1.0% Co, 0.60% Mn, 0.50% Cr, 0.50% Mo, 0.35% Si, 0.10% C, 0.025% S, and0.025% P.

The types of invar include NILO 36 (Invar-36), NILO 365, NILO 42(Invar-42), NILO 475, NILO 48 (Invar-48), NILOMAG 77, and NILO-K(Kovar). The heating device capable of uniform sealing according to theembodiment of the disclosure may use anyone selected from among theabove types.

NILO 36 has a specific gravity of 8.11 g/cm³ and a melting range of1430° C.

NILO 36 is a nickel-iron alloy containing 36% nickel and has a lowexpansion coefficient.

In particular, NILO 36 does not expand at all at room temperature, showsa low coefficient of expansion even at 260° C., and has excellentstrength and toughness at low temperatures.

NILO 365 has a specific gravity of 8.11 g/cm³ and a melting range of1334° C. to 1409° C.

NILO 365 is a heat-reinforced, age-hardened, low-expansion alloy, whichis a higher-strength, lower-expansion alloy than a nickel-iron mixedalloy.

NILO 42 has a specific gravity of 8.11 g/cm³ and a melting range of1435° C.

NILO 42 is a nickel-iron expansion-controlling alloy including 42%nickel and has a low coefficient of thermal expansion from roomtemperature to 300° C.

NILO 475 has a specific gravity of 8.18 g/cm³ and a melting range of360° C.

NILO 475 is a nickel-iron-chromium expansion-controlling alloy including47% nickel and has thermal expansion properties that match well withlead and soda-lime type soft glass at permissible temperatures.

NILO 48 has a specific gravity of 8.20 g/cm³ and a melting range of1450° C.

NILO 48 is a nickel-iron expansion-controlling alloy including 48%nickel.

NILOMAG 77 has a specific gravity of 8.77 g/cm³.

NILOMAG 77 is a nickel-iron alloy with copper and molybdenum added and alow loss soft magnetic alloy with a high initial penetration rate.

NILO-K has a specific gravity of 8.16 g/cm³ and a melting range of 1450°C.

NILO-K is a nickel-iron-cobalt expansion-controlling alloy including 29%nickel and has the characteristic that the expansion coefficientdecreases as the temperature rises to the inflection point.

The heater 10 using these invars as the primary material can heat andseal the sealing portion to a uniform temperature without thermaldeformation even when the temperature difference between the centralpart and both side parts is 10° C.

In other words, the heater 10 uniformly supplies heat at a constanttemperature to the entire sealing portion, thereby heating the entiresealing portion to a uniform temperature so that the sealing thicknessis constant.

The heat source supplier 20 supplies a heat source to the heater 10 sothat the heater 10 heats the sealing portion.

The heat source supplier 20 may be formed of a cartridge heatercomprising a round bar accommodated in the first accommodating space 10a and forming an exterior and a nichrome wire accommodated in the roundbar and formed in a coil shape.

The nichrome wire may generate heat by receiving external power.

When the heat source supplier 20 is heated, heat is conducted to theheater 10, and the heater 10 is heated to heat the sealing portion.

Depending on the pouch-type secondary battery, the heater 10 may beprepared in various lengths.

At this time, even if the heat source supplier 20 supplies the heatsource to the heater 10 in reality, the entire heater 10 does notgenerate heat at a uniform temperature.

In other words, both sides of the heat source supplier 20 are heated ata lower temperature than the center, and thereby both sides of theheater 10 are also heated at a lower temperature compared to the centerof the heater 10.

Further, the temperature difference between the center and both sides ofthe heater 10 is about 10° C. to about 20° C.

When the sealing portion is heated with the heated heater 10 asdescribed above, the temperature of the heat transferred to the part incontact with the central portion of the heater 10 among the sealingportion is different from the temperature of the heat transferred to thepart in contact with both sides thereof. As a result, there is a problemthat the entire sealing portion is not uniformly heated.

The heat transfer part 30 has a configuration applied to address theseissues.

In other words, the heat transfer part 30 transmits the heat sourcealong the longitudinal direction of the heater 10 so that the entireheater 10 is heated at a uniform temperature.

To this end, the heat transfer unit 30 may be formed of a heat pipe,which is illustrated in FIG. 4 .

The heat pipe as the heat transfer part 30 has a thermal conductivity ofabout 500 times higher than platinum, about 1,300 times higher thancopper, and about 2,000 times higher than a general hot water pipe.

The inside of the heat transfer part 30 is vacuum-treated, and a certainamount of liquid (working fluid) is filled therein.

When the heat source supply unit 20 heats the heater 10, heat is appliedto one end (right), the working fluid is evaporated, and it moves to theopposite side (left) due to the pressure difference.

Since the right side is cold, the heat in the evaporated working fluidis removed, and the gas is changed to liquid again. That is, theliquid-gas state is repeatedly changed and circulated within the heattransfer part 30.

Then, the working fluid changes into a liquid and returns to itsoriginal position along a wick of the inner surface of the heat transferpart 30. In other words, the phase change between liquid and gas occursand heat transfer occurs actively.

Accordingly, the right side of the heat transfer part 30 is heated bythe heat source of the heat source supplier 20 transferred from theheater 10 in a state accommodated in the second accommodation space 10b. While the embedded working fluid is repeatedly cycled of evaporation(heat absorption) and condensation (heat dissipation), heat transfer isinstantaneous (about 3 seconds per M) without a separate power source orancillary equipment, and heat transfer is performed with thermalconductivity of approximately 98.5% so that the entire heater 10 can beheated at almost the same temperature.

Meanwhile, the heat pipe, which is the heat transfer part 30, does notform a perfect circle having the same outer diameter because the roundbar body forming the exterior is made of copper.

That is, since the outer surface of the heat transfer part 30 is unevenas shown in FIG. 4 , the entire outer surface does not completelycontact the inner surface of the heater 10 but only intermittentlycontacts the inner surface of the heater 10.

In this case, the heat of the heat transfer part 30 is not efficientlytransferred to the heater 10 due to the non-contact region, so theentire heater 10 cannot be heated at a uniform temperature.

The additional heat transfer part 40 has a configuration applied toaddress these issues.

To this end, the additional heat transfer part 40 is formed of thermalgrease and is disposed of on the outer surface of the heat transfer part30.

As an example, the heat transfer part 30 and the additional heattransfer part 40 may be applied to the heater 10 in a manner in whichthermal grease, which is the additional heat transfer part 40, is evenlyapplied to the entire outer circumferential surface of the heat transferunit 30, and then accommodates the heat transfer part 30 in the secondaccommodating space 10 b.

As another example, after accommodating the heat transfer part 30 in thesecond accommodating space 10 b, the additional heat transfer part 40may be injected between the outer surface of the heat transfer part 30and the inner surface of the heater 10.

In this case, the additional heat transfer part 40 may be filled in aninjection device such as the known silicon gun and may be injectedbetween the outer surface of the heat transfer part 30 and the innersurface of the heater 10 by the injection device.

When the additional heat transfer part 40 is applied to the outersurface of the heat transfer part 30 or the additional heat transferpart 40 is injected between the outer surface of the heat transfer part30 and the inner surface of the heater 10, the additional heat transferpart 40 is in contact with the inner surface of the heater 10.

Thermal grease is a material that transfers heat and fills a fine spacebetween the outer surface of the heat transfer part 30 and the innersurface of the heater 10 to increase the thermal conductivity of theheat transfer part 30 to the heater 10.

When the heat transfer part 30 and the additional heat transfer part 40are applied to the heater 10, the temperature difference between thecentral portion of the heater 10 and both side portions thereof isreduced to within ±3° C., thereby heating the entire sealing portion atalmost the same temperature so that eventually, the entire sealingportion may be sealed uniformly.

It is revealed that the temperature difference between the centralportion and both side portions of the heater 10 may vary depending onthe size, material, thickness, size, length, and other requirements ofthe heater 10.

Furthermore, since the heating device for sealing capable of uniformsealing 1 according to an embodiment of the disclosure may uniformlyheat the entire area of the heater 10 to a desired temperature throughthe heat transfer part 30, the entire sealing portion may be melted withproperties suitable for sealing, so that the sealing device maycompletely seal the sealing portion within a shorter time, less pressingforce and low temperature compared to in the prior art.

Therefore, it is possible to increase the sealing force of the sealingportion. It is possible to prevent cracks in the sealing portioncompared to the conventional sealing method only with a sealing device.It is possible to prevent the sealing portion from being excessivelydeformed or melted in shape and physical properties due to the hightemperature of the sealing device. It is possible to perfectly seal theentire sealing portion in a uniform shape.

Further, the heat transfer part 30 has a heat storage function tominimize heat loss, thereby improving sealing performance and quality.

Meanwhile, the blocking part 50 has a configuration in which the heattransfer part 30 is accommodated in the second accommodation space 10 b,and it is then inserted into both ends of the second accommodation space10 b to close.

The blocking part 50 includes a heat insulating material with low or nothermal conductivity, preventing heat loss in the second accommodationspace 10 b from leaking to the outside, and preventing the heat transferpart 30 from leaving the outside.

In this case, at least one through-hole 50 a may be formed in theblocking part 50.

The pressure generated in the second accommodation space 10 b by theoperation of the heat source supplier 20 is discharged to the outsidethrough the through-hole 50 a to prevent the internal pressure of theheater 10 from increasing, thereby ensuring product stability.

Next, another embodiment of the heat transfer part 30 applied to theheating device capable of uniform sealing 1 according to an embodimentof the disclosure will be described regarding FIGS. 7 and 8 .

FIG. 7 is a perspective view illustrating an example in which aninjection guide part is applied to a heat transfer part applied to aheating device capable of uniform sealing according to an embodiment ofthe disclosure, and FIG. 8 is a front view illustrating an example inwhich a heat transfer part and an additional heat transfer part of FIG.7 are applied to the heater.

As shown in FIGS. 7 and 8 , the injection guide part 31 may be formed onthe circumferential surface of the heat transfer part 30.

The injection guide parts 31 are formed to be spaced apart from eachother at a predetermined distance along the circumferential surface ofthe heat transfer part 30.

The injection guide part 31 may be formed to be long in the longitudinaldirection of the heat transfer part 30.

The injection guide part 31 may be formed of the same material as theheat transfer part 30.

For example, after the heat transfer part 30 is prepared, the injectionguide part 31 may be separately coupled thereto.

For another example, the injection guide part 31 may be integrallyformed when the heat transfer part 30 is prepared. In this case, theheat transfer part 30 and the injection guide part 31 may be integrallyformed by a molding die.

After the heat transfer part 30 is accommodated in the secondaccommodation space 10 b, the additional heat transfer part 40 isinjected between the injection guide units 31 so that the additionalheat transfer part 40 may be partitioned, and the additional heattransfer part 40 may be easily injected by the guide of the injectionguide part 31.

Those of ordinary skill in the art to which the disclosure pertains willunderstand that the disclosure may be embodied in other specific formswithout changing the technical spirit or essential features thereof.Therefore, it should be understood that the embodiments described aboveare illustrative in all respects and not restrictive. It should beunderstood that the scope of the disclosure is indicated by the claimsto be described later rather than the above-detailed description, andall changes or modifications derived from the meaning and scope of theclaims and their equivalent concepts are included in the scope of thedisclosure.

What is claimed is:
 1. A heating device capable of uniform sealing,comprising: a heater for heating the sealing portion of to-be-sealedobject; a heat source supplier for supplying a heat source for heatingto the heater; a heat transfer part accommodated in the heater andtransferring the heat source to the heater to heat the entire heater ata uniform temperature; and an additional heat transfer part disposed onthe outer surface of the heat transfer part to conduct the heat sourceto the heater and in contact with the inner surface of the heater. 2.The heating device of claim 1, wherein the heater is formed of nobiniteor invar.
 3. The heating device of claim 1, wherein the heater isprovided with a first accommodating space for accommodating the heatsource supplier and a second accommodating space for accommodating theheat transfer part along the longitudinal direction.
 4. The heatingdevice of claim 3, wherein the heater further comprises blocking partsfor closing both ends of the second accommodating space, and wherein theblocking parts include at least one through-hole.
 5. The heating deviceof claim 1, wherein the heat transfer part is formed of a heat pipe. 6.The heating device of claim 1, wherein the additional heat transfer partis formed of thermal grease.